Wine Spoilage: How Microbes Affect Taste
- A frustrating problem for winemakers is when wine fermentation gets "stuck." This happens when yeast stops converting grape sugar into alcohol and carbon dioxide too early.
- The key lies in a prion, an abnormally shaped protein capable of self-replication.
- Linda Bisson, a yeast geneticist and professor at the University of California, Davis, said the finding offers insights into preventing stuck fermentations.
Unlocking the secret to perfect wine: Scientists have discovered a biochemical process that causes “stuck” wine fermentations, were yeast inexplicably ceases converting sugar into alcohol. This breakthrough offers winemakers a path to prevent spoilage, pinpointing a prion-driven mechanism that hijacks yeast behavior. Bacteria, utilizing this prion, shift yeast to option carbon sources, hindering the crucial fermentation process. Effective strategies include adjusting sulfur dioxide levels or choosing specific yeast strains, all potentially leading to more consistent, high-quality wines.News Directory 3 provides the latest insights into this interesting research,exploring how winemakers can adapt their techniques. Discover what’s next in the realm of wine science and production.
Scientists Uncover Key to Preventing “Stuck” Wine Fermentation
Updated May 28, 2025
A frustrating problem for winemakers is when wine fermentation gets “stuck.” This happens when yeast stops converting grape sugar into alcohol and carbon dioxide too early. Germs then consume the remaining sugar,spoiling the wine. now, scientists believe they’ve found a biochemical interaction responsible for this issue, potentially offering solutions for preventing it.
The key lies in a prion, an abnormally shaped protein capable of self-replication. This protein allows bacteria in fermenting wine to shift yeast away from sugar and toward other food sources, all without altering the yeast’s DNA. The research highlights the complex interplay between microorganisms during the wine making process.
Linda Bisson, a yeast geneticist and professor at the University of California, Davis, said the finding offers insights into preventing stuck fermentations. her team aims to identify yeast strains that ignore the signal triggered by bacteria and do not form the prion, thus maintaining efficient fermentation. This research into the role of yeast in wine fermentation could also improve understanding of metabolic diseases like Type 2 diabetes in humans, Bisson added.
For years, biologists have known about an ancient organic circuit in yeast cell membranes that prevents yeast from using other carbon sources when sugar is present. This “sugar suppression” is notably strong in *Saccharomyces cerevisiae*, the yeast species used in winemaking, brewing, and bread-making